Does Screen Mirroring Slow Down Wi-Fi? (We Checked)

Screen mirroring, also known as media streaming or wireless display, is a way to share your phone or laptop’s screen with your TV.

It can be enabled by using a third-party app or pressing a TV remote button to activate it.

In this article, I will explain why this might be true and help explain some tips that could speed things up.

Here’s If Screen Mirroring Slows Down Wi-Fi:

Yes, it can slow down your Wi-Fi. Screen mirroring is simply another device connecting to your network, which will use up some of your bandwidth. The application itself doesn’t use much speed to function but a slow internet speed can cause problems.

Hands holding a smartphone on the background of the screen. MirrorShare is a standard Huawei screen mirroring application. This app can send your Android screen to smart TV.

With most smartphones and tablets, you can quickly reduce the amount of data being used during screen mirroring by turning off audio and video that you don’t need.

This can make all the difference in how smoothly your experience goes.

If you’re new to the world of screen mirroring, you might be wondering how it works and if it slows down your Wi-Fi.

Here’s a quick overview:

  • What is screen mirroring? Screen mirroring allows you to view content from one device on another. For example, with screen mirroring, you can watch a movie that’s stored on your Macbook on your TV.
  • How does screen mirroring work? For this to happen, the device that’s sending the content and the device that’s receiving it have to be connected through a Wi-Fi network or Bluetooth connection.
  • What is Wi-Fi? Wi-Fi is a technology that allows devices to send and receive data wirelessly over specific networks. If a network uses Wi-Fi, any device (like a computer or phone) can connect with it without an ethernet cable plugged in.

Now let’s talk about how these two things relate to each other:

  • Screen mirroring uses up your bandwidth when streaming video or audio from one device to another.
  • When you use screen mirroring, some of your devices will run slower than usual because there isn’t as much speed left for them.

How Come My Wi-Fi Is Slower When Using Screen Mirroring?

Whether you use screen mirroring with a Fire TV Stick, Miracast, or Apple AirPlay, the basic idea is to wirelessly send video from your computer or phone to a bigger screen.

However, this can sometimes cause lag in the Wi-Fi connection.

Understanding why lag happens when you use screen mirroring helps to know how screen mirroring works.

Screen mirroring is often called casting because it sends your device’s content to another display—just like you would cast individual shows and movies to a TV using something like Chromecast.

But there are several ways that devices can connect wirelessly: over Wi-Fi, Bluetooth 4.0 (or newer), using Wi-Fi Direct (also known as peer-to-peer), or using Miracast technology.

Which of these protocols is used depends on the type of devices being used and other factors such as whether multiple people are casting at once in the same home network.

Can Using Screen Mirroring Directly Affect My Wi-Fi Speed?

While screen mirroring can affect your Wi-Fi connection, it doesn’t have to. Whether or not it does depends on the speed of your Internet connection and the strength of your network signal.

The Wi-Fi speed depends on both the sending and receiving devices. Some devices are indeed more powerful than others, but several other factors play a role in a good user experience when it comes to screen mirroring:

  • The power of the sending device will determine how fast the data is sent to the receiving device. If this process is slower than real-time, you’ll notice a slight delay in what you see on your screen. You might also experience glitches in audio or video playback and freezes on slow connections. However, faster connections such as 5 GHz networks or wired Ethernet connections will be less noticeable (or unnoticeable at all).
  • Your Wi-Fi network can also impact speed if there’s interference from nearby wireless devices like cell phones and baby monitors. But this is rare for most homes today since most homes use dual-band routers that simultaneously broadcast signals at 2.4GHz and 5GHz frequencies (and these frequencies don’t interfere with each other). The best way to avoid interference issues would be to set up separate guest networks for guests who want to connect their mobile devices while they visit you.

How Does Screen Mirroring Work?

Screen Mirroring is a technology that allows you to mirror your device’s screen on your TV screen wirelessly.

This means that everything you see on your device screen will also be displayed on the TV screen.

So, if you want to play games, watch movies, or show pictures and other media files on a big screen, then the best way is to use screen mirroring.

It’s important to realize that Screen Mirroring is not like casting because only specific apps are supported in casting. At the same time, with Screen Mirroring, everything that’s being done on the mobile device can be mirrored to the TV.

How Do I Check If It Interferes With My Wi-Fi Connection?

You can quickly check the effect the connection has on your Wi-Fi network. To do this, you need to check the speed of your network with and without screen mirroring.

The easiest way to do this is to use a speed test app on your phone or tablet, but you can also use Google to determine your speed.

A simple way to check if your mirroring slows down your Wi-Fi is by using a speed test. You can do this either by using a speed tester app on your phone or by going on Google and typing in “speed test.”

The little box that appears will allow you to test your Wi-Fi speed.

It will let you know how fast your internet connection is at that moment and provide other helpful information.

To do this test:

  • Open a browser window and go to a speed test site like,, or
  • Click the “Begin Test” button, then wait for the results. The download speed is the most important number here—this is your Wi-Fi’s raw data transfer rate, and it can be used to help determine the most extensive file you could download in a second (60 megabytes per second would let you download a 6GB file in one minute).
  • Now that you have that number unplug your Ethernet cable (if it’s plugged in) and then start screen mirroring between your mobile device and computer.
  • When finished, run another speed test to see if there’s any difference between the two results.

How Much Bandwith Does Screen Mirroring Use?

Screen mirroring itself is not a bandwidth-heavy process. It typically uses around 1Mb/s, which is less than the average Wi-Fi speed in the U.S. (35.9Mb/s).

However, the video streaming service will use more bandwidth, especially if you’re watching high-definition content.
Netflix recommends a minimum of 3Mb/s for SD and 5Mbps for HD viewing.

Screen mirroring a movie may be possible at lower speeds, but you may have issues with buffering and lag time, mainly as your connection fluctuates or when other devices use Wi-Fi.

Suppose you’re planning on screen mirroring HD content from your mobile device to a TV via Google Chromecast or an Apple TV. In that case, it’s best to have fast internet (over 12Mbps) for the smoothest performance and best picture quality.

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Can You Stop Screen Mirroring From Interfering With Your Wi-Fi?

The fact is that it depends on what kind of router you have.

This is because the problem is actually with your router, not with your devices or the screen-mirroring technology itself.

When you mirror a device’s screen to a TV, it sends a constant stream of data through your network—but some routers are just not that great at handling this kind of heavy traffic.

If your Wi-Fi goes out regularly when you’re mirroring something, it’s probably not because of anything you’re doing wrong; it’s because your router wasn’t made to handle streaming in the first place (or because it’s an older model).

It might be time to consider upgrading to a better model.

If you’ve made the switch and are still having problems, there are a few other things you can do to fix your Wi-Fi issues:

  • Identify the bad device – The first step in eliminating interference is figuring out whether it’s coming from your own devices or someone else’s. If it’s someone else’s device causing the interference, changing the password for your network should (hopefully) get rid of the interference—and once you change it, you can go back to doing what you were doing without fear of interruptions. However, if you’re dealing with interference from your own devices, things are a bit more complicated.
  • Lower your resolution – The higher the resolution, the more data must be transmitted between devices—so lowering it will make things easier on your network.
  • Turn off automatic updates – When apps update automatically in the background, they’re sending extra information through your network—which can slow down everything else that’s happening there too.

In order to stop screen mirroring from causing interference with your Wi-Fi network, you need to turn it off on all of your devices. This includes:

  • Your TV
  • The device that you use for streaming (e.g., Roku or Apple TV)
  • Your smartphone and laptop

If you’re wondering how to turn off screen mirroring on your TV, there isn’t a straightforward answer—it depends on the brand of TV you have.

You may need to consult its manual or call tech support to figure out how to turn it off. On an iPhone, simply swipe up from the bottom of the screen and tap AirPlay Mirroring. Then tap Off.


In this article, you learned about the effect of screen mirroring on your Wi-Fi connection. To briefly recap, it’s essential to know that screen mirroring does not slow down your Wi-Fi.

The most likely culprits are other devices using your Wi-Fi at the same time and/or a weak signal that’s been affected by device placement or walls or ceilings blocking the signal.

If you are experiencing a slow internet connection while screen mirroring, ensure that you’re getting a solid home Internet connection. Make sure to check your device placement in relation to where the router is located (preferably in the same room).

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